Convert given no into rupee representation

rupee_repr.py

# Money in INR(Indian Rupees)
 
def convert(no):
    rev_no = no[::-1]
 
    ans = ''
    for index, char in enumerate(rev_no):
        ans = char + ans
        if index >= 2 and index % 2 == 0 and len(no) > index + 1:
            ans = ',' + ans
    return ans
 
print 'Input in INR:', convert('49')
print 'Input in INR:', convert('149')
print 'Input in INR:', convert('1497')
print 'Input in INR:', convert('14945')
print 'Input in INR:', convert('149999')
print 'Input in INR:', convert('1499994')
print 'Input in INR:', convert('14999942')

Output

1497 => 1,497
14945 => 14,945
149999 => 1,49,999
1499994 => 14,99,994
14999942 => 1,49,99,942